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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>解构默认值</title>

    <script>
        // 解构默认值
        let [x, y = 'b'] = ['a'];
        console.log(x);// 'a'
        console.log(y);// 'b'
    </script>
</head>
<body>
    
</body>
</html>